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Three-phase Axial-field Brushless Motor for Direct Telescope Drive

Three-phase Axial-field Brushless Motor for Direct Telescope Drive. Dave Rowe September 25, 2007. Three-phase Axial-field Brushless Pancake Motor. 24 coils arranged in three phases. 32 magnets on soft steel annulus. Motor diameter = 20”. Stator. Rotor. D. Rowe 9-25-07.

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Three-phase Axial-field Brushless Motor for Direct Telescope Drive

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  1. Three-phase Axial-field Brushless Motorfor Direct Telescope Drive Dave Rowe September 25, 2007

  2. Three-phase Axial-field Brushless Pancake Motor 24 coils arranged in three phases 32 magnets on soft steel annulus Motor diameter = 20” Stator Rotor D. Rowe 9-25-07

  3. Motor Cross-section D. Rowe 9-25-07

  4. Magnetic Field Calculation • [24 mm x 12 mm] N42 NdFeB magnet • [16 mm x 6.3 mm] coil (one side shown) • 3 mm coil-magnet spacing • 6-mm thick soft steel annulus • Average B-field = 2900 Gauss in vertical direction • Calculated by ViziMag Azmuthal Cross Section D. Rowe 9-25-07

  5. Motor Analysis • 3-phase motor • 4.5 ohms per phase • 20 AWG wire • 4.4 N-m/amp per phase • ~ 7 N-m/amp for three phase operation • 14 N-m maximum, 12 V system • 30 N-m maximum, 24 V system • Can drive 30” telescope • ~ $100 for magnets • ~ $ 40 for wire • ~ $ 20 for steel annulus • Some assembly required D. Rowe 9-25-07

  6. Simple Servo Loop Model D. Rowe 9-25-07

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